package com.xiaodao.netty.socketexample2;

import io.netty.channel.Channel;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.SimpleChannelInboundHandler;
import io.netty.channel.group.ChannelGroup;
import io.netty.channel.group.DefaultChannelGroup;
import io.netty.util.concurrent.GlobalEventExecutor;


/**
 * Created by xiaodao
 * date: 2019/11/30
 */
public class MyChatServerHandler extends SimpleChannelInboundHandler<String> {

    private static ChannelGroup channelGroup= new DefaultChannelGroup(GlobalEventExecutor.INSTANCE);

    @Override
    protected void channelRead0(ChannelHandlerContext ctx, String msg) throws Exception {
        Channel channel = ctx.channel();
        channelGroup.forEach(ch->{
            if(ch!=channel){
                ch.writeAndFlush(channel.remoteAddress()+" 发送的消息:" + msg+"\n");
            }else {
                ch.writeAndFlush("[自己] "+ msg+"\n");
            }
        });
    }

    @Override
    public void exceptionCaught(ChannelHandlerContext ctx, Throwable cause) throws Exception {

        cause.printStackTrace();
        ctx.close();
    }

    @Override
    public void channelActive(ChannelHandlerContext ctx) throws Exception {

        Channel channel = ctx.channel();

        System.out.println(channel.remoteAddress()+" 上线");
    }

    @Override
    public void channelInactive(ChannelHandlerContext ctx) throws Exception {

        System.out.println(ctx.channel().remoteAddress() +" 下线");
    }

    @Override
    public void handlerAdded(ChannelHandlerContext ctx) throws Exception {

        Channel channel = ctx.channel();
        channelGroup.writeAndFlush("[服务器]- "+ channel.remoteAddress() +" 加入\n");
        channelGroup.add(channel);

    }

    @Override
    public void handlerRemoved(ChannelHandlerContext ctx) throws Exception {

        Channel channel = ctx.channel();
        channelGroup.writeAndFlush("[服务器]- "+ channel.remoteAddress() +" 离开\n");
        System.out.println(channelGroup.size());
        //group自动会删除
//        channelGroup.remove(channel);
    }
}
